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<div class="title">arm_fft_bin_example_f32.c</div>  </div>
</div><!--header-->
<div class="contents">
<div class="fragment"><div class="line"><span class="comment">/* ----------------------------------------------------------------------</span></div>
<div class="line"><span class="comment">* Copyright (C) 2010-2012 ARM Limited. All rights reserved.</span></div>
<div class="line"><span class="comment">*</span></div>
<div class="line"><span class="comment">* $Date:         17. January 2013</span></div>
<div class="line"><span class="comment">* $Revision:     V1.4.0</span></div>
<div class="line"><span class="comment">*</span></div>
<div class="line"><span class="comment">* Project:       CMSIS DSP Library</span></div>
<div class="line"><span class="comment">* Title:             arm_fft_bin_example_f32.c</span></div>
<div class="line"><span class="comment">*</span></div>
<div class="line"><span class="comment">* Description:   Example code demonstrating calculation of Max energy bin of</span></div>
<div class="line"><span class="comment">*                frequency domain of input signal.</span></div>
<div class="line"><span class="comment">*</span></div>
<div class="line"><span class="comment">* Target Processor: Cortex-M4/Cortex-M3</span></div>
<div class="line"><span class="comment">*</span></div>
<div class="line"><span class="comment">* Redistribution and use in source and binary forms, with or without</span></div>
<div class="line"><span class="comment">* modification, are permitted provided that the following conditions</span></div>
<div class="line"><span class="comment">* are met:</span></div>
<div class="line"><span class="comment">*   - Redistributions of source code must retain the above copyright</span></div>
<div class="line"><span class="comment">*     notice, this list of conditions and the following disclaimer.</span></div>
<div class="line"><span class="comment">*   - Redistributions in binary form must reproduce the above copyright</span></div>
<div class="line"><span class="comment">*     notice, this list of conditions and the following disclaimer in</span></div>
<div class="line"><span class="comment">*     the documentation and/or other materials provided with the</span></div>
<div class="line"><span class="comment">*     distribution.</span></div>
<div class="line"><span class="comment">*   - Neither the name of ARM LIMITED nor the names of its contributors</span></div>
<div class="line"><span class="comment">*     may be used to endorse or promote products derived from this</span></div>
<div class="line"><span class="comment">*     software without specific prior written permission.</span></div>
<div class="line"><span class="comment">*</span></div>
<div class="line"><span class="comment">* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS</span></div>
<div class="line"><span class="comment">* &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT</span></div>
<div class="line"><span class="comment">* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS</span></div>
<div class="line"><span class="comment">* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE</span></div>
<div class="line"><span class="comment">* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,</span></div>
<div class="line"><span class="comment">* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,</span></div>
<div class="line"><span class="comment">* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;</span></div>
<div class="line"><span class="comment">* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER</span></div>
<div class="line"><span class="comment">* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT</span></div>
<div class="line"><span class="comment">* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN</span></div>
<div class="line"><span class="comment">* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE</span></div>
<div class="line"><span class="comment">* POSSIBILITY OF SUCH DAMAGE.</span></div>
<div class="line"><span class="comment"> * -------------------------------------------------------------------- */</span></div>
<div class="line"> </div>
<div class="line"><span class="preprocessor">#include &quot;<a class="code" href="arm__math_8h.html">arm_math.h</a>&quot;</span></div>
<div class="line"><span class="preprocessor">#include &quot;<a class="code" href="arm__const__structs_8h.html">arm_const_structs.h</a>&quot;</span></div>
<div class="line"> </div>
<div class="line"><span class="preprocessor">#define TEST_LENGTH_SAMPLES 2048</span></div>
<div class="line"> </div>
<div class="line"><span class="comment">/* -------------------------------------------------------------------</span></div>
<div class="line"><span class="comment">* External Input and Output buffer Declarations for FFT Bin Example</span></div>
<div class="line"><span class="comment">* ------------------------------------------------------------------- */</span></div>
<div class="line"><span class="keyword">extern</span> <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> <a name="a0"></a><a class="code" href="arm__fft__bin__example__f32_8c.html#a3d8ecb82590486ceebccc76263963b16">testInput_f32_10khz</a>[<a name="a1"></a><a class="code" href="arm__fft__bin__example__f32_8c.html#abc004a7fade488e72310fd96c0a101dc">TEST_LENGTH_SAMPLES</a>];</div>
<div class="line"><span class="keyword">static</span> <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> <a class="code" href="arm__dotproduct__example__f32_8c.html#a324833b61eae796082e07d078a67c34f">testOutput</a>[<a class="code" href="arm__fft__bin__example__f32_8c.html#abc004a7fade488e72310fd96c0a101dc">TEST_LENGTH_SAMPLES</a>/2];</div>
<div class="line"> </div>
<div class="line"><span class="comment">/* ------------------------------------------------------------------</span></div>
<div class="line"><span class="comment">* Global variables for FFT Bin Example</span></div>
<div class="line"><span class="comment">* ------------------------------------------------------------------- */</span></div>
<div class="line">uint32_t <a name="a2"></a><a class="code" href="arm__fft__bin__example__f32_8c.html#a9b500899c581f6df3ffc0a9f3a9ef6aa">fftSize</a> = 1024;</div>
<div class="line">uint32_t <a name="a3"></a><a class="code" href="arm__fft__bin__example__f32_8c.html#a379ccb99013d369a41b49619083c16ef">ifftFlag</a> = 0;</div>
<div class="line">uint32_t <a name="a4"></a><a class="code" href="arm__fft__bin__example__f32_8c.html#a4d2e31c38e8172505e0a369a6898657d">doBitReverse</a> = 1;</div>
<div class="line"> </div>
<div class="line"><span class="comment">/* Reference index at which max energy of bin ocuurs */</span></div>
<div class="line">uint32_t <a name="a5"></a><a class="code" href="arm__fft__bin__example__f32_8c.html#aec50b0f697fd9e7e7e244487a4bd57e4">refIndex</a> = 213, <a name="a6"></a><a class="code" href="arm__fft__bin__example__f32_8c.html#a4a391651dbb95db35ccba70fc4f9e049">testIndex</a> = 0;</div>
<div class="line"> </div>
<div class="line"><span class="comment">/* ----------------------------------------------------------------------</span></div>
<div class="line"><span class="comment">* Max magnitude FFT Bin test</span></div>
<div class="line"><span class="comment">* ------------------------------------------------------------------- */</span></div>
<div class="line"> </div>
<div class="line">int32_t <a name="a7"></a><a class="code" href="arm__fft__bin__example__f32_8c.html#a52d2cba30e6946c95578be946ac12a65">main</a>(<span class="keywordtype">void</span>)</div>
<div class="line">{</div>
<div class="line"> </div>
<div class="line">  <a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> <a name="a8"></a><a class="code" href="arm__dotproduct__example__f32_8c.html#a88ccb294236ab22b00310c47164c53c3">status</a>;</div>
<div class="line">  <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> maxValue;</div>
<div class="line"> </div>
<div class="line">  <a class="code" href="arm__dotproduct__example__f32_8c.html#a88ccb294236ab22b00310c47164c53c3">status</a> = <a name="a9"></a><a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a9f8b2a10bd827fb4600e77d455902eb0">ARM_MATH_SUCCESS</a>;</div>
<div class="line"> </div>
<div class="line">  <span class="comment">/* Process the data through the CFFT/CIFFT module */</span></div>
<div class="line">  <a name="a10"></a><a class="code" href="group__ComplexFFT.html#gade0f9c4ff157b6b9c72a1eafd86ebf80">arm_cfft_f32</a>(&amp;<a name="a11"></a><a class="code" href="arm__const__structs_8h.html#a05abc294a9159abbd6ffb4f188fe18b1">arm_cfft_sR_f32_len1024</a>, <a class="code" href="arm__fft__bin__example__f32_8c.html#a3d8ecb82590486ceebccc76263963b16">testInput_f32_10khz</a>, <a class="code" href="arm__fft__bin__example__f32_8c.html#a379ccb99013d369a41b49619083c16ef">ifftFlag</a>, <a class="code" href="arm__fft__bin__example__f32_8c.html#a4d2e31c38e8172505e0a369a6898657d">doBitReverse</a>);</div>
<div class="line"> </div>
<div class="line">  <span class="comment">/* Process the data through the Complex Magnitude Module for</span></div>
<div class="line"><span class="comment">  calculating the magnitude at each bin */</span></div>
<div class="line">  <a name="a12"></a><a class="code" href="group__cmplx__mag.html#gaba4e0eff7816fe80d01121fb4cf6c6bc">arm_cmplx_mag_f32</a>(<a class="code" href="arm__fft__bin__example__f32_8c.html#a3d8ecb82590486ceebccc76263963b16">testInput_f32_10khz</a>, <a class="code" href="arm__dotproduct__example__f32_8c.html#a324833b61eae796082e07d078a67c34f">testOutput</a>, <a class="code" href="arm__fft__bin__example__f32_8c.html#a9b500899c581f6df3ffc0a9f3a9ef6aa">fftSize</a>);</div>
<div class="line"> </div>
<div class="line">  <span class="comment">/* Calculates maxValue and returns corresponding BIN value */</span></div>
<div class="line">  <a name="a13"></a><a class="code" href="group__Max.html#gad1eabd31544fe59c414d9ce5bd0cc151">arm_max_f32</a>(<a class="code" href="arm__dotproduct__example__f32_8c.html#a324833b61eae796082e07d078a67c34f">testOutput</a>, <a class="code" href="arm__fft__bin__example__f32_8c.html#a9b500899c581f6df3ffc0a9f3a9ef6aa">fftSize</a>, &amp;maxValue, &amp;<a class="code" href="arm__fft__bin__example__f32_8c.html#a4a391651dbb95db35ccba70fc4f9e049">testIndex</a>);</div>
<div class="line"> </div>
<div class="line">  <span class="keywordflow">if</span> (<a class="code" href="arm__fft__bin__example__f32_8c.html#a4a391651dbb95db35ccba70fc4f9e049">testIndex</a> !=  <a class="code" href="arm__fft__bin__example__f32_8c.html#aec50b0f697fd9e7e7e244487a4bd57e4">refIndex</a>)</div>
<div class="line">  {</div>
<div class="line">    <a class="code" href="arm__dotproduct__example__f32_8c.html#a88ccb294236ab22b00310c47164c53c3">status</a> = <a name="a14"></a><a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a09457f2be656b35015fd6d36202fa376">ARM_MATH_TEST_FAILURE</a>;</div>
<div class="line">  }</div>
<div class="line"> </div>
<div class="line">  <span class="comment">/* ----------------------------------------------------------------------</span></div>
<div class="line"><span class="comment">  ** Loop here if the signals fail the PASS check.</span></div>
<div class="line"><span class="comment">  ** This denotes a test failure</span></div>
<div class="line"><span class="comment">  ** ------------------------------------------------------------------- */</span></div>
<div class="line"> </div>
<div class="line">  <span class="keywordflow">if</span> ( <a class="code" href="arm__dotproduct__example__f32_8c.html#a88ccb294236ab22b00310c47164c53c3">status</a> != <a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a9f8b2a10bd827fb4600e77d455902eb0">ARM_MATH_SUCCESS</a>)</div>
<div class="line">  {</div>
<div class="line">    <span class="keywordflow">while</span> (1);</div>
<div class="line">  }</div>
<div class="line"> </div>
<div class="line">  <span class="keywordflow">while</span> (1);                             <span class="comment">/* main function does not return */</span></div>
<div class="line">}</div>
<div class="line"> </div>
</div><!-- fragment --> </div><!-- contents -->
</div><!-- doc-content -->
<div class="ttc" id="aarm__fft__bin__example__f32_8c_html_abc004a7fade488e72310fd96c0a101dc"><div class="ttname"><a href="arm__fft__bin__example__f32_8c.html#abc004a7fade488e72310fd96c0a101dc">TEST_LENGTH_SAMPLES</a></div><div class="ttdeci">#define TEST_LENGTH_SAMPLES</div><div class="ttdef"><b>Definition:</b> arm_fft_bin_example_f32.c:100</div></div>
<div class="ttc" id="aarm__dotproduct__example__f32_8c_html_a324833b61eae796082e07d078a67c34f"><div class="ttname"><a href="arm__dotproduct__example__f32_8c.html#a324833b61eae796082e07d078a67c34f">testOutput</a></div><div class="ttdeci">float32_t testOutput</div><div class="ttdef"><b>Definition:</b> arm_dotproduct_example_f32.c:142</div></div>
<div class="ttc" id="aarm__dotproduct__example__f32_8c_html_a88ccb294236ab22b00310c47164c53c3"><div class="ttname"><a href="arm__dotproduct__example__f32_8c.html#a88ccb294236ab22b00310c47164c53c3">status</a></div><div class="ttdeci">arm_status status</div><div class="ttdef"><b>Definition:</b> arm_dotproduct_example_f32.c:144</div></div>
<div class="ttc" id="aarm__math_8h_html_a4611b605e45ab401f02cab15c5e38715"><div class="ttname"><a href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a></div><div class="ttdeci">float float32_t</div><div class="ttdoc">32-bit floating-point type definition.</div><div class="ttdef"><b>Definition:</b> arm_math.h:541</div></div>
<div class="ttc" id="aarm__math_8h_html"><div class="ttname"><a href="arm__math_8h.html">arm_math.h</a></div></div>
<div class="ttc" id="aarm__math_8h_html_a5e459c6409dfcd2927bb8a57491d7cf6a09457f2be656b35015fd6d36202fa376"><div class="ttname"><a href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a09457f2be656b35015fd6d36202fa376">ARM_MATH_TEST_FAILURE</a></div><div class="ttdeci">@ ARM_MATH_TEST_FAILURE</div><div class="ttdef"><b>Definition:</b> arm_math.h:515</div></div>
<div class="ttc" id="aarm__fft__bin__example__f32_8c_html_a9b500899c581f6df3ffc0a9f3a9ef6aa"><div class="ttname"><a href="arm__fft__bin__example__f32_8c.html#a9b500899c581f6df3ffc0a9f3a9ef6aa">fftSize</a></div><div class="ttdeci">uint32_t fftSize</div><div class="ttdef"><b>Definition:</b> arm_fft_bin_example_f32.c:111</div></div>
<div class="ttc" id="aarm__fft__bin__example__f32_8c_html_a4d2e31c38e8172505e0a369a6898657d"><div class="ttname"><a href="arm__fft__bin__example__f32_8c.html#a4d2e31c38e8172505e0a369a6898657d">doBitReverse</a></div><div class="ttdeci">uint32_t doBitReverse</div><div class="ttdef"><b>Definition:</b> arm_fft_bin_example_f32.c:113</div></div>
<div class="ttc" id="aarm__math_8h_html_a5e459c6409dfcd2927bb8a57491d7cf6a9f8b2a10bd827fb4600e77d455902eb0"><div class="ttname"><a href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a9f8b2a10bd827fb4600e77d455902eb0">ARM_MATH_SUCCESS</a></div><div class="ttdeci">@ ARM_MATH_SUCCESS</div><div class="ttdef"><b>Definition:</b> arm_math.h:509</div></div>
<div class="ttc" id="aarm__fft__bin__example__f32_8c_html_a3d8ecb82590486ceebccc76263963b16"><div class="ttname"><a href="arm__fft__bin__example__f32_8c.html#a3d8ecb82590486ceebccc76263963b16">testInput_f32_10khz</a></div><div class="ttdeci">float32_t testInput_f32_10khz[TEST_LENGTH_SAMPLES]</div><div class="ttdef"><b>Definition:</b> arm_fft_bin_data.c:47</div></div>
<div class="ttc" id="agroup__ComplexFFT_html_gade0f9c4ff157b6b9c72a1eafd86ebf80"><div class="ttname"><a href="group__ComplexFFT.html#gade0f9c4ff157b6b9c72a1eafd86ebf80">arm_cfft_f32</a></div><div class="ttdeci">void arm_cfft_f32(const arm_cfft_instance_f32 *S, float32_t *p1, uint8_t ifftFlag, uint8_t bitReverseFlag)</div><div class="ttdoc">Processing function for the floating-point complex FFT.</div><div class="ttdef"><b>Definition:</b> arm_cfft_f32.c:1162</div></div>
<div class="ttc" id="aarm__math_8h_html_a5e459c6409dfcd2927bb8a57491d7cf6"><div class="ttname"><a href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a></div><div class="ttdeci">arm_status</div><div class="ttdoc">Error status returned by some functions in the library.</div><div class="ttdef"><b>Definition:</b> arm_math.h:507</div></div>
<div class="ttc" id="aarm__const__structs_8h_html"><div class="ttname"><a href="arm__const__structs_8h.html">arm_const_structs.h</a></div></div>
<div class="ttc" id="aarm__fft__bin__example__f32_8c_html_a52d2cba30e6946c95578be946ac12a65"><div class="ttname"><a href="arm__fft__bin__example__f32_8c.html#a52d2cba30e6946c95578be946ac12a65">main</a></div><div class="ttdeci">int32_t main(void)</div><div class="ttdef"><b>Definition:</b> arm_fft_bin_example_f32.c:122</div></div>
<div class="ttc" id="aarm__fft__bin__example__f32_8c_html_a4a391651dbb95db35ccba70fc4f9e049"><div class="ttname"><a href="arm__fft__bin__example__f32_8c.html#a4a391651dbb95db35ccba70fc4f9e049">testIndex</a></div><div class="ttdeci">uint32_t testIndex</div><div class="ttdef"><b>Definition:</b> arm_fft_bin_example_f32.c:116</div></div>
<div class="ttc" id="agroup__cmplx__mag_html_gaba4e0eff7816fe80d01121fb4cf6c6bc"><div class="ttname"><a href="group__cmplx__mag.html#gaba4e0eff7816fe80d01121fb4cf6c6bc">arm_cmplx_mag_f32</a></div><div class="ttdeci">void arm_cmplx_mag_f32(const float32_t *pSrc, float32_t *pDst, uint32_t numSamples)</div><div class="ttdoc">Floating-point complex magnitude.</div><div class="ttdef"><b>Definition:</b> arm_cmplx_mag_f32.c:156</div></div>
<div class="ttc" id="agroup__Max_html_gad1eabd31544fe59c414d9ce5bd0cc151"><div class="ttname"><a href="group__Max.html#gad1eabd31544fe59c414d9ce5bd0cc151">arm_max_f32</a></div><div class="ttdeci">void arm_max_f32(const float32_t *pSrc, uint32_t blockSize, float32_t *pResult, uint32_t *pIndex)</div><div class="ttdoc">Maximum value of a floating-point vector.</div><div class="ttdef"><b>Definition:</b> arm_max_f32.c:263</div></div>
<div class="ttc" id="aarm__fft__bin__example__f32_8c_html_a379ccb99013d369a41b49619083c16ef"><div class="ttname"><a href="arm__fft__bin__example__f32_8c.html#a379ccb99013d369a41b49619083c16ef">ifftFlag</a></div><div class="ttdeci">uint32_t ifftFlag</div><div class="ttdef"><b>Definition:</b> arm_fft_bin_example_f32.c:112</div></div>
<div class="ttc" id="aarm__const__structs_8h_html_a05abc294a9159abbd6ffb4f188fe18b1"><div class="ttname"><a href="arm__const__structs_8h.html#a05abc294a9159abbd6ffb4f188fe18b1">arm_cfft_sR_f32_len1024</a></div><div class="ttdeci">const arm_cfft_instance_f32 arm_cfft_sR_f32_len1024</div><div class="ttdef"><b>Definition:</b> arm_const_structs.c:145</div></div>
<div class="ttc" id="aarm__fft__bin__example__f32_8c_html_aec50b0f697fd9e7e7e244487a4bd57e4"><div class="ttname"><a href="arm__fft__bin__example__f32_8c.html#aec50b0f697fd9e7e7e244487a4bd57e4">refIndex</a></div><div class="ttdeci">uint32_t refIndex</div><div class="ttdef"><b>Definition:</b> arm_fft_bin_example_f32.c:116</div></div>
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